一种宽范围270V转28V机载计算机电源设计

Design of avionics computer 270V to 28V power supply with the wide range of input voltage

机载270V转28V计算机电源具有宽范围输入的特点,且负载往往也存在大范围变化,使软开关电源设计难度提升.针对该问题提出一种应用buck+LLC电路的设计,LLC工作在定频的开环控制状态,并在buck电路中引入电感电流闭环,在保证软开关效果的同时,增强了对输入电压和负载变化的抗扰性.在Matlab中的仿真结果证明了其有效性.

The Characteristics,including wide-range variation of input voltage and load condition,increase the difficulty of design for avionics computer 270 V to 28 V power supply.To solve this problem,a design based on the buck+LLC circuit is proposed.In this strategy,LLC converter works at the open-loop-controlled soft-switching condition with the invariant switching frequency.Furthermore,inductor current feedback is employed for suppressing the disturbance of the input and load variation.Simulating results in Matlab testify the validity of the design.